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Addition of small (1–5 vol %) amounts of ionic liquids (ILs) increases the Am(III) distribution ratio in the system with diphenyl(dibutylcarbamoylmethyl)phosphine oxide (Ph2Bu2) by more than 2 orders of magnitude. With 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C4mim]+Tf2N−) used as IL, the Am(III) extraction is possible even from 8 M HNO3, which is important in radiochemical analysis of process and environmental samples, because many procedures are based on the transfer of solid samples into 8 M HNO3. The extraction data show that the extractable Am(III) complex contains three Ph2Bu2 ligands, an IL anion, and two NO 3 − anions.
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Pribylova et al. (2012) studied this question.
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